Data Events Listener should be changed
Data Events Listener should be changed

Currently in the README.md file contains ,
```java
geoQuery.addGeoQueryEventListener(new GeoQueryDataEventListener() {
```  (Line 293)
which needs to be changed to,
```java
geoQuery.addGeoQueryDataEventListener(new GeoQueryDataEventListener() {
```
firebase/geofire-java,firebase/geofire-java,firebase/geofire-java